I've got a '79 CM400T that I've been driving around everywhere until recently. The bike sat on my back porch for about a week while I was running errands with my pickup. When I jumped back onto the CM, something was amiss; it wouldn't shift into 2nd, 4th, or 5th. When it feels like it should be in these gears, the bike just freewheels. 1st and 3rd work perfectly. This was strange since the bike ran and shifted perfectly when I parked it. I drove it around the block a couple of times today trying to see if it was the linkage or the internals of the tranny. ONE time i got it to shift into 4th gear (and drove), but once I shifted back down at the stop sign all I had was 1st and 3rd again.
The shift linkage "feels" like it's going into all of the gears.
With the bike sitting still on the centerstand and engine OFF, I can sometimes get it to engage into all 5 gears. Never twice in a row, though.
What the heck is going on??
